The Sentinel D‑Box Twin Fan 150mm (Stock Ref: SENT150T) is a high-performance demand ventilation unit suitable for commercial environments. It supports duct diameters from 100mm to 500mm, providing airflow rates between 0.001 and 1.3 m³/s and pressures up to 650 Pa. Fitted with energy-saving EC/DC motors and a lockable isolator, this fan ensures efficient operation and straightforward maintenance. Its durable Aluzinc construction allows installation both indoors and outdoors. Manufactured to BS EN ISO 9001 standards and performance-tested to BS848 Part 1 & 2, the Sentinel D‑Box Twin offers reliable and energy-efficient ventilation for a variety of commercial applications.